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Calpamos is the fifth planet from the star Zeta 2 Reticuli. It is a fairly large ringed planet with 3 small moons, one of which is LV426 Acheron. Calpamos features in the film Alien and other media that reference the film Alien or Aliens, although not named as such in all media.
Reference stats table.
In Aliens: Colonial Marines Collector's Edition, the dossier lists LV426 as a moon (one of two) orbiting a small ringed planet Calpamos. Although different from the films it uses script references of the diameter, with the smaller size of 1200kms (120kms from Alien (film) script).
Calpamos reference is from the Aliens: Colonial Marines Collector's Edition mission briefing.
Zeta Reticuli systems consists of the suns Zeta Reticuli and Zeta 2 Reticuli.